Effects of buprofezin on different developmental stages of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood) (Homoptera: Aleyrodidae)

Buprofezin (2-tert-butylimino-3-isopropyl-5-phenyl-3, 4, 5, 6-tetrahydro-2H-1, 3, 5-thiadiazin-4-one, Applaud[○!R]) showed toxicity to each developmental stage of the greenhouse whitefly, Trialeurodes vaporariorum (WESTWOOD). The larvae died within five days after treatment, showing abnormal molting. The LC50s of buprofezin for the first, second, third, early and middle fourth instar larvae were 0.659, 0.482, 2.45, 11.6 and 15.7 ppm, respectively. Buprofezin was more excellent than chinomethionat, methidathion and fenvarerate in larvicidal action on all stages except the late fourth instar larvae (i.e. pupae). More slow-killing effect of buprofezin was observed on the adults. Buprofezin, being weak in ovicidal action, showed an effect on the adults to lay unhatchable eggs.